fixed indentation and removed unnecessary empty line

src/objective-c/tests/GRPCClientTests.m

@@ -277,7 +277,6 @@ static ProtoMethod *kUnaryCallMethod;
                     @"Foo grpc-objc/0.13.0 grpc-c/0.14.0-dev (ios)",
                     @"Did not receive expected user agent %@",
                     call.responseHeaders[@"x-grpc-test-echo-useragent"]);
-
     [response fulfill];
   } completionHandler:^(NSError *errorOrNil) {
     XCTAssertNil(errorOrNil, @"Finished with unexpected error: %@", errorOrNil);